package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//过滤器写法

//@WebFilter("/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req=(HttpServletRequest) servletRequest;
        HttpServletResponse res=(HttpServletResponse) servletResponse;

        String requestURI = req.getRequestURI();
        //1、设置不用拦截路径
        String[] urls= {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(req,res);
            return;
        }

        if (req.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id{}",req.getSession().getAttribute("employee"));
            filterChain.doFilter(req,res);
            return;
        }

        log.info("用户未登录");
        res.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
